[Rick TYler]

Originally Posted by cooker52

1501 has used Chromolly tubing on our past two robots. It's light and strong. We gas weld it, but I believe you can use better methods of welding.

I'm not sure that you aren't using the best method already. Most of the best bicycles in the world before the advent of aluminum in the late 1980's were made out of brazed chromoly. Gas welded or brazed joints in 4130 chromoly should be at least as strong as the tubes themselves. It would be interesting to build a competition robot frame using full racing bike chromoly techniques, with butted tubing and even lugs in the joints. I understand that metallurgical advantages mean that welded joints work just as well as lugged and brazed joints, but it would certainly look old-school cool...